Isotope Effect in the Superfluid Density of HTS Cuprates: Stripes, Pseudogap and Impurities

Abstract

Underdoped cuprates exhibit a normal-state pseudogap, and their spins and doped carriers tend to spatially separate into 1- or 2-D stripes. Some view these as central to superconductivity, others as peripheral and merely competing. Using La${}_{2-x}$Sr${}_x$Cu${}_{1-y}$Zn${}_y$O${}_4$ we show that an oxygen isotope effect in $T_c$ and in the superfluid density can be used to distinguish between the roles of stripes and pseudogap and also to detect the presence of impurity scattering. We conclude that stripes and pseudogap are distinct, and both compete and coexist with superconductivity.

arXiv commentRevised submission to PRL with added appendix on a possible isotope effect in the effective mass, 4 pages, 3 figures

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• Strain-induced enhancement of $T_c$ in infinite-layer Pr${}_{0.8}$Sr${}_{0.2}$NiO${}_2$ films
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• Correlation between oxygen isotope effects on the transition temperature and the magnetic penetration depth in high-temperature superconductors close to optimal doping
• Isotope effects in high-Tc cuprate superconductors: Ultimate proof for bipolaron theory of superconductivity
• Magnetic field dependence of the oxygen isotope effect on the magnetic penetration depth in hole-doped cuprate superconductors
• Large isotope effect on $T_c$ in cuprates despite of a small electron-phonon coupling
• Robust d-wave superconductivity from the Su-Schrieffer-Heeger-Hubbard model: possible route to high-temperature superconductivity
• The Isotope Effect in Superconductors
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• Isotope effect on the transition temperature $T_c$ in Fe-based superconductors: the current status
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• Estimation of Cooper pair density and its relation to the critical current density in hole doped high-Tc cuprate superconductors